package org.minuframework.encrypt;

import java.math.BigInteger;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.minuframework.lang.StringUtils;

/**
 * AES加密、解密
 * @author 米mi
 * @deprecated
 */
public class AESU {
    
    // 算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";
    
    /**
     * AES加密为base 64 code
     * @param  content    待加密的内容
     * @param  encryptKey 加密密钥
     * @return            加密后的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
        return base64Encode(aesEncryptToBytes(content, encryptKey));
    }
    
    /**
     * 将base 64 code AES解密
     * @param  encryptStr 待解密的base 64 code
     * @param  decryptKey 解密密钥
     * @return            解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }
    
    /**
     * AES加密
     * @param  content    待加密的内容
     * @param  encryptKey 加密密钥
     * @return            加密后的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));
        
        return cipher.doFinal(content.getBytes("utf-8"));
    }
    
    /**
     * AES解密
     * @param  encryptBytes 待解密的byte[]
     * @param  decryptKey   解密密钥
     * @return              解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes, "UTF-8");
    }
    
    /**
     * base 64 encode
     * @param  bytes 待编码的byte[]
     * @return       编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes) {
        return Base64.encodeBase64String(bytes);
    }
    
    /**
     * base 64 decode
     * @param  base64Code 待解码的base 64 code
     * @return            解码后的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception {
        return StringUtils.isEmpty(base64Code) ? null : BASE64U.base64Dec(base64Code);
    }
    
    /**
     * 将byte[]转为各种进制的字符串
     * @param  bytes byte[]
     * @param  radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
     * @return       转换后的字符串
     */
    public static String binary(byte[] bytes, int radix) {
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
    }
    
}
